Battery Cell Electrolyte Bladder for Swelling and Lithium Plating
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Solution Overview
Problem
Battery performance deterioration due to lithium precipitation and local electrolyte depletion during charging and discharging, especially in batteries with low group margin designs.
Innovation Solution
Incorporating a closed liquid bladder within the battery cell housing, which holds an additional electrolyte and features weakened structures that allow the electrolyte to flow out and replenish the main electrolyte compartment when pressure reaches a threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a low group margin design is adopted to accommodate battery core bulging, then the battery can accommodate expansion, but lithium precipitation occurs and battery performance deteriorates
Solution Approach 1:
A liquid bladder filled with electrolyte is introduced as an intermediary component between the battery core and the housing. The bladder absorbs expansion forces through deformation and automatically replenishes electrolyte when pressure reaches a threshold, mediating between the conflicting requirements of expansion accommodation and performance maintenance.
Solution Approach 2:
The liquid bladder is designed with weakened structures that enable automatic electrolyte replenishment when expansion pressure reaches a threshold value. The system self-regulates without external intervention, maintaining electrolyte levels and preventing lithium precipitation through autonomous pressure-responsive behavior.
2Productivity
If continuous charge-discharge cycles are performed, then battery usage function is achieved, but electrolyte is continuously consumed leading to local depletion
Solution Approach 1:
The liquid bladder stores additional electrolyte that is recovered and replenished into the battery housing when the main electrolyte level drops. This recycling mechanism prevents electrolyte depletion while maintaining continuous charge-discharge operation capability.
Solution Approach 2:
The system automatically detects electrolyte depletion through pressure changes and triggers self-replenishment from the liquid bladder, eliminating the need for external monitoring or intervention during continuous cycling operations.
3Reliability
If electrolyte level is maintained to prevent lithium precipitation, then battery performance is preserved, but device complexity increases
Solution Approach 1:
The liquid bladder with pressure-responsive weakened structures provides automatic electrolyte level maintenance without requiring external sensors, control systems, or active pumping mechanisms. The passive pressure-driven design maintains performance while minimizing added complexity.
Solution Approach 2:
The weakened structures are designed with specific pressure thresholds that trigger electrolyte release. By tuning these pressure parameters, the system automatically maintains optimal electrolyte levels corresponding to safe operating conditions without complex control logic.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design alleviates battery performance degradation by maintaining electrolyte levels, preventing lithium precipitation, and effectively managing expansion pressures within the battery cell.
Implementation Method 1
when a pressure in the liquid bladder reaching a threshold value, the another electrolyte in the liquid bladder breaking through the weakened structure and flowing out of the liquid bladder
Implementation Method 2
when the side wall of the battery core extrudes the liquid bladder, causing the liquid bladder to deform and fill an empty area in the battery housing to relieve an expansion pressure of the battery core
Data Source
AI summary
The present application discloses a battery cell, a battery and a power consumption apparatus. The battery cell may include: a housing filled with an electrolyte inside; at least one core assembly arranged in the housing and at least one closed liquid bladder holding another electrolyte, the liquid bladder being arranged in the housing, and at least being provided corresponding to a side wall of the core assembly; at least one weakened structure being provided on the liquid bladder. Under a condition that a pressure in the liquid bladder reaches a threshold value, the another electrolyte in the liquid bladder may break through the weakened structure and flow out of the liquid bladder.